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Finding the Fourth Proportional to 15,211.17, 20,978.33 and 9,904.05

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Solution

The fourth proportional to 15,211.17, 20,978.33 and 9,904.05 is: 13,659.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,211.17 : 20,978.33 = 9,904.05 : x
  2. Step 2: Convert to fraction form
    15,211.17/20,978.33 = 9,904.05/x
  3. Step 3: Cross multiply
    15,211.17x = 20,978.33 × 9,904.05
  4. Step 4: Simplify right side
    15,211.17x = 207,770,379.72
  5. Step 5: Solve for x
    x = 207,770,379.72/15,211.17
  6. Step 6: Final answer
    x = 13,659.07

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.